abstract class AbstractLogger {
    public static int INFO = 1;
    public static int DEBUG = 2;
    public static int ERROR = 3;

    protected int level;
    protected AbstractLogger nextLogger;

    public void setNextLogger(AbstractLogger nextLogger) {
        this.nextLogger = nextLogger;
    }

    public void logMessage(int level, String message) {
        if ( this.level <= level ) write(message);

        if ( nextLogger !=null ) nextLogger.logMessage(level, message);
    }

    abstract protected void write(String message);
}

class ConsoleLogger extends AbstractLogger {
    public ConsoleLogger(int level) {
        this.level = level;
    }

    @Override
    protected void write(String message) {
        System.out.println("Standard Console::Logger: " + message);
    }
}
class ErrorLogger extends AbstractLogger {
    public ErrorLogger(int level) {
        this.level = level;
    }

    @Override
    protected void write(String message) {
        System.out.println("Error Console::Logger: " + message);
    }
}
class FileLogger extends AbstractLogger {
    public FileLogger(int level) {
        this.level = level;
    }

    @Override
    protected void write(String message) {
        System.out.println("File::Logger: " + message);
    }
}

public class ChainDemo {
    public static void main(String[] args) {
        AbstractLogger loggerChain = getChainOfLoggers();

        loggerChain.logMessage(AbstractLogger.INFO, "This is an information.");
        loggerChain.logMessage(AbstractLogger.DEBUG, "This is an debug level information.");
        loggerChain.logMessage(AbstractLogger.ERROR, "This is an error information.");
    }

    private static AbstractLogger getChainOfLoggers() {
        AbstractLogger errorLogger = new ErrorLogger(AbstractLogger.ERROR);
        AbstractLogger fileLogger = new FileLogger(AbstractLogger.DEBUG);
        AbstractLogger consoleLogger = new ConsoleLogger(AbstractLogger.INFO);

        errorLogger.setNextLogger(fileLogger);
        fileLogger.setNextLogger(consoleLogger);

        return errorLogger;
    }
}
